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Inventors:

Bechtel, Dr. Helmut (Philips Corporate I.P. GmbH,Habsburgerallee 11, 52064 Aachen, DE)
Busselt, Wolfgang (Philips Corporate I.P. GmbH,Habsburgerallee 11, 52064 Aachen, DE)
Jüstel, Dr. Thomas (Philips Corporate I.P. GmbH,Habsburgerallee 11, 52064 Aachen, DE)
Weibrecht, Martin (Philips Corporate I.P. GmbH,Habsburgerallee 11, 52064 Aachen, DE)
Quadflieg, Peter (Philips Corporate I.P. GmbH,Habsburgerallee 11, 52064 Aachen, DE)

Application Number:

EP20010000410

Publication Date:

10/04/2006

Filing Date:

08/30/2001

Export Citation:

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Assignee:

Philips Intellectual Property & Standards GmbH (Steindamm 94, 20099 Hamburg, DE)
Koninklijke Philips Electronics N.V. (Groenewoudseweg 1, 5621 BA Eindhoven, NL,;FR,;GB)

International Classes:

H01J29/18; H01J29/26

View Patent Images:

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Foreign References:

5091718				Color-monochrome visual display device
5277841				Mixed blue emitting phosphor
5866977				Phosphor screen with double layered blue phosphor and method thereof

Other References:

PATENT ABSTRACTS OF JAPAN vol. 1999, no. 09, 30. Juli 1999 (1999-07-30) & JP 11 096923 A (FUJITSU LTD), 9. April 1999 (1999-04-09)

Attorney, Agent or Firm:

Volmer, Georg (Philips Intellectual Property & Standards GmbH, Postfach 50 04 42, 52088 Aachen, DE)

Claims:

1. A color picture screen provided with a blue phosphor layer (9) which comprises a first, blue-emitting phosphor having a light emission in a range from 430 to 490 nm, characterized in that said layer further comprises a second phosphor having a deep-violet light emission in a range from 380 to 450 nm.

2. A color picture screen as claimed in claim 1, characterized in that the second phosphor has a light emission in a range from 380 to 420 nm.

3. A color picture screen as claimed in claim 1, characterized in that the second phosphor is chosen from the group comprising Tb³⁺-activated phosphors, Eu²⁺-activated phosphors, Bi³⁺-activated phosphors, Ga³⁺-activated phosphors, and Ce³⁺-activated phosphors.

4. A color picture screen as claimed in claim 3, characterized in that the second phosphor is chosen from the group comprising LaOBr:Tb, Y₂O₂S:Tb, Y₃Al₅O₁₂:Tb, Ca₃(PO₄)₂:Eu, Sr₂P₂O₇:Eu, (Sr,Mg)₂P₂O₇:Eu CaB₂P₂O₉:Eu, CaSO₄:Eu, CaO:Bi, ZnO:Ga and (Y,Gd)BO₃:Ce.

5. A color picture screen as claimed in claim 1, characterized in that the phosphor layer comprises a physical mixture of particles of the first phosphor and particles of the second phosphor.

6. A color picture screen as claimed in claim 5, characterized in that the proportional quantity of the second phosphor in the phosphor layer lies between 5 and 50% by weight in relation to the quantity of the first phosphor.

7. A color picture screen as claimed in claim 1, characterized in that the phosphor layer has a base layer comprising the first phosphor and a covering layer comprising the second phosphor.

8. A color picture screen as claimed in claim 1, characterized in that the first phosphor is chosen from the group comprising ZnS:Ag, BaMgAl₁₀O₁₇:Eu and (Ba,Sr,Ca)₅(PO₄)₃Cl:Eu.

9. A color picture screen as claimed in claim 1, characterized in that the color picture screen is chosen from the group comprising cathode ray tubes, plasma picture screens, and liquid crystal picture screens.

Description:

Die Erfindung betrifft einen Farbbildschirm, insbesondere einen Plasmabildschirm, ausgerüstet mit einer blauen Leuchtstoffschicht.

Zur Darstellung von farbigen Bildern auf Bildschirmen bedient man sich der additiven Farbmischung. Ein großer Teil der in der Natur vorkommenden Farben lassen sich durch additive Mischung der drei Primärfarben rot, grün und blau entsprechender Intensität darstellen. Dieses Prinzip wird sowohl in emittierenden Bildschirmen wie Kathodenstrahlröhren oder Plasmabildschirmen als auch in nicht-emittierenden Bildschirmen wie Flüssigkristallbildschirmen angewendet.

Die Darstellung der verschiedenen Farben ist durch sogenannte Normfarbkurven festgelegt. Ein weit verbreiteter Standard ist das CIE Farbdreieck. Der Bereich der darstellbaren Farben in einem Bildschirm wird durch die Farbpunkte der drei Leuchtstoffe, gegeben durch das jeweilige Emissionsspektrum, definiert.

Aufgrund der charakteristischer Farbempfindung des menschlichen Auges trägt die blaue Lichtemission am wenigstens zur Luminanz (Helligkeit) eines Bildschirms bei.

US-5866977 offenbart einem Farbbildschirm mit einer blauen Leuchtstoffschicht, die zwei verschiedene blau-emittierende Leuchtstoffe umfaßt.

Aus US 5,277,841 ist ein gemischter blau emittierender Leuchtstoff aus einem Gemisch von ZnS:Ag,Al mit mindestens einem grün-emittierenden Leuchtstoff aus der Gruppe aus Y ₃ (Al,Ga) ₅ O ₁₂ :Tb, Y ₂ SiO ₅ Tb und LaOCl:Tb bekannt, das die Luminanz und die Luminanz-Sättigungs-Charakteristik erhöht.

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